四维

对于四维CT图像，研究和实现了两种提取呼吸信号的方法。

For the four-dimensional CT images , two kinds of respiratory signal extraction methods have been implemented .

D+CD4→CD3+D2反应的四维量子散射计算

Four-dimensional quantum scattering calculations on the D + CD_ 4 → CD_ 3 + D_ 2 reaction

礼义廉耻，国之四维。

Sense of propriety , righteousness , honesty , and shame are the four cardinal virtues in running a nation .

域Fp上四维结合代数的同构分类

Classification of Associative Algebras of Dimension 4 Over Field F_p

基于DSP的四维混沌系统生成

The 4-D Chaos Signal Generation Based on DSP

秘鲁产人参保健品HPLC和四维UV指纹图谱研究

Study of HPLC-FPS and 4-Dimensional UV-FPS of Peru 's Ginseng healthcare product

具有U（3）U×（3）内部对称性的四维弦模型

Four Dimensional String Model with U ( 3 )× U ( 3 ) Internal Symmetry

变分同化中的伴随方程伴随方程在水汽资料四维同化中的应用I.理论

The Four-Dimension Assimilation Problem of Water Vapour by Means of the Adjoint Equation Part I. Theory

根据这一性质，本文第五章在实验设计时引入pH值作为第四维。

In chapter 5 , we introduced the fourth dimension ( pH dimension ) in the design of experiment according to this property .

挑战·机遇·前瞻加入WTO的影像文化之透视简论声像四维空间电影理论新路探析

Challenge , Opportunity and Forward-looking-Movie and Audiovisual Culture after China 's Entry into the WTO in Perspective The Four Dimensions of the Audiovisual Space

六自由度Stewart平台四维工作空间搜索方法

Four dimension workspace search method for six degree of freedom Stewart platform

通过测定在5个不同pH值条件下不同浓度的盐酸普鲁卡因的激发发射荧光光谱，构建四维荧光量测矩阵。

A four-way response data array was constructed by measuring excitation-emission matrix fluorescence of different concentrations of procaine hydrochloride in five different pH values .

从四维Langevin方程的MonteCarlo模拟计算裂变碎片动能分布

Calculation of the kinetic-energy distributions of fission-fragments from Monte-Carlo simulation to the four-dimensional Langevin equation

使用四维坐标来表示物体的透视变换矩阵，通过对该矩阵进行归一化处理，简化了Z坐标的计算；

Using 4D coordinate to express the convert matrix of perspective , it is predigested to calculate Z coordinate through changing to one .

与常规闭管扩散的均匀恒定温度场不同，激光诱导扩散是在四维（x，y，z，t）非均匀温度场中进行。

Laser induced diffusion is performed within a non-homogenous 4-D temperature field , which is different with the normal closed-ampoule diffusion in a homogenous and steady temperature field .

1843年，威廉汉密尔顿（williamhamilton）在都柏林发明了四元数，将虚数扩展到四维空间。

Quaternions , which extend imaginary numbers into a further dimension , began to be developed by William Hamilton in Dublin in 1843 .

目前，四维地震或者说时移地震方法是CCS安全性监测的最有效手段。

In general , 4D seismic monitoring or time-lapsed seismic method becomes a necessary process for security of CCS .

广义四维谐振子位势的B-S波函数

B-S wave function for a generalized four-dimensional harmonic oscillator

此外，在直线加速器上嵌入两正交的X射线成像系统，以实时跟踪肿瘤目标的位置，也是四维放疗研究的一个方向。

Moreover , two orthogonal X-ray imaging systems mounted on the gantry of a medical linear accel-erator for tracking the real position of tumor is also an interesting aspect in 4-dimensional radiotherapy study .

在此基础上，通过增加一维坐标轴可以进一步实现四维Lorenz散点图的分析。

On this basis , by increasing the one-dimensional axes we can further come to the 4-D Lorenz plots analysis .

同时指出我国国土资源大调查的重点在开展微型化嵌入式GIS、三维/四维GIS、网络GIS等方面的研究。

And it is pointed out that the key to the China 's survey of territorial resources lies in carrying out such researches as embedded GIS , 3D / 4D GIS , web GIS , etc.

Minkowski时空中的四维力

4-dimension force in Minkowski spacetime

利用傅立叶变换，求出了低速双荷粒子系统在双四维势下具有Lorentz变换协变性的辐射频谱。

Finally , by using the Fourier transformation we get the Lorentz covariant electromagnetic radiation spectrum for the low speed moving dyons .

四维Brouwer不动点定理的改进

The Improvement of Four Dimensional Brouwer Fixed Point Theorem

四维自时滞Rossler系统的同步及其在音频通信中的应用

Synchronization of 4D Time-delay Chaotic Rossler System and Its Application to Voice Communication

本文分别研究了含多参数的四维映射系统的周期倍化分叉和Hopf分叉的参数临界值的代数判据。

Two criteria for determining the critical parameter values of period doubling bifurcation or Hopf bifurcation of a general four dimension mapping system are presented in this paper .

利用改进变分法求出了正切作用量的四维SU（2）格点规范理论的元格内能和比热曲线。

By using improved variational method , the internal energy per plaquette and the specific heat curves of the Tangent action in SU ( 2 ) lattice gauge theory arc worked out .

文章研究了一类四维信息保障（IA）模型，包括IA目标维、IA能力维、IA措施维和IA时间维。

A four-dimensional IA model was studied in this paper , which includes IA object dimension , IA capability dimension , IA countermeasure dimension and IA time dimension .

本文导出旋转的Rayleigh-Benard问题的四维Lorenz模型并对该模型进行数值求解，分析系统参数对Lorenz吸引子的影响。

A four-dimensional Lorenz model for rotating Rayleigh-Benard problem is derived in this paper and the solution of the model is numerically investigated .

利用高速DSP芯片TMS320C25乘加流水线及块操作指令提高机载PD火控雷达四维跟踪系统数据处理速度。

Utilization of the multiply / accumulate pipeline and block move instructions is shown to improve data processing speed in an airborne PD fire controlled Radar 4 dimension tracking system .